Daikin EBLQ05+07CAV3 Installer's Reference Manual page 82

12 Troubleshooting
12.3.4 Symptom: The pressure relief valve opens
Possible causes
The expansion vessel is broken
The water volume in the
installation is too high
The water circuit head is too high The water circuit head is the
12.3.5 Symptom: The water pressure relief valve
leaks
Possible causes
Dirt is blocking the water
pressure relief valve outlet
12.3.6 Symptom: The space is NOT sufficiently
heated at low outdoor temperatures
Possible causes
If the system contains a backup
heater: backup heater operation
is not activated
Installer reference guide
82
Corrective action
Replace the expansion vessel.
Make sure that the water volume
in the installation is below the
maximum allowed value (see
"6.3.3 To check the water volume
and flow rate" on page 27 and
"6.3.4 Changing the pre-pressure
of the expansion vessel" on
page 28).
difference in height between the
outdoor unit and the highest
point of the water circuit. If the
outdoor unit is located at the
highest point of the installation,
the installation height is
considered 0 m. The maximum
water circuit head is 10 m.
Check the installation
requirements.
Corrective action
Check whether the pressure
relief valve works correctly by
turning the red knob on the valve
counterclockwise:
▪ If you do NOT hear a clacking
sound, contact your dealer.
▪ If the water keeps running out
of the unit, close both the
water inlet and outlet shut-off
valves first and then contact
your dealer.
Corrective action
Check and make sure that:
▪ The backup heater operation
mode is enabled. Go to:
▪ [A.5.1.1] > Installer settings
> Heat sources > Backup
heater > Operation mode
[4‑00]
▪ The thermal protector of the
backup heater has not been
activated. If it has, check:
▪ The water pressure
▪ Whether there is air in the
system
▪ The air purge operation
Press the reset button in the
switch box. See
"14.4 Components" on page 92
for the location of the reset
button.
Possible causes
If the system contains a backup
heater: the backup heater
equilibrium temperature has not
been configured correctly
If the system contains a backup
heater: the overcurrent fuse has
operated
If the system contains a backup
heater: the thermal protector has
operated
There is air in the system
Too much heat pump capacity is
used for heating domestic hot
water (applies only to
installations with a domestic hot
water tank)
12.3.7 Symptom: The pressure at the tapping
point is temporarily unusual high
Possible causes
Failing or blocked pressure relief
valve.
12.3.8 Symptom: Decoration panels are pushed
away due to a swollen tank
Possible causes
Failing or blocked pressure relief
valve.
12.3.9 Symptom: Tank disinfection function is
NOT completed correctly (AH-error)
Possible causes
The disinfection function was
interrupted by domestic hot water
tapping
EBLQ05+07CAV3 + EDLQ05+07CAV3 + EKCB07CAV3 +
EK2CB07CAV3 + EKMBUHCA3V3 + EKMBUHCA9W1
Daikin Altherma low temperature monobloc
Corrective action
Increase the "equilibrium
temperature" to activate the
backup heater operation at a
higher outdoor temperature. Go
to:
▪ [A.5.1.4] > Installer settings >
Heat sources > Backup heater
> Equilibrium temp. OR
▪ [A.8] > Installer settings >
Overview settings [5‑01]
Check the fuse and switch it back
on
Check the thermal protector and
reset it by pushing the button
Purge air manually (see "To
perform a manual air purge" on
page 76) or use the automatic air
purge function (see "To perform
an automatic air purge" on
page 76).
Check and make sure that the
"space heating priority" settings
have been configured
appropriately:
▪ Make sure that the "space
heating priority status" has
been enabled. Go to [A.8] >
Installer settings > Overview
settings [5‑02]
▪ Increase the "space heating
priority temperature" to
activate backup heater
operation at a higher outdoor
temperature. Go to [A.8] >
Installer settings > Overview
settings [5‑03]
Corrective action
▪ Flush and clean the complete
tank including the piping
between pressure relief valve
and the cold water inlet.
▪ Replace the pressure relief
valve.
Corrective action
Contact your local dealer.
Corrective action
Program the start-up of the
disinfection function when the
coming 4 hours NO domestic hot
water tapping is expected.
4P405544-1 – 2015.03